OJ Wheels 54mm, 101a/95a Double Duro Mini Combo black and grey. Double Duros are a new approach to wheel design and manufacturing from OJ Wheels featuring a 101a outer durometer wrapped around a 95a inner durometer. Double Duros combine the benefits of our best 101a and 95a formulas, proven to absorb rugged terrain while providing the speed and slide of 101a urethane. The blend of our best formulas gives you a roll like no other and makes impossible terrain work. Mini Combos feature a wide road surface for stability and consistent slide and an asymmetrical shape, cut with a round back and conical front for customizing your set up.